Boiler flue



Jan. 22, 1935. GAUTZSCH 1,988,968

BOILER FLUE Filed Oct. 28. 1953 Patented Jan. 22, 1935 UNITED STATES PATENT OFFICE Application October 28, 1933, Serial No. 695,609 In Germany October 28, 1932 1 Claim.

This invention relates to a boiler flue and has for its object to increase the output thereof as well as that of the furnace while simultaneously providing for the automatic removal of flue dust 5 from the flue by constructing the latter in the form of a twisted and water-filled laminated body and causing the flame to pass through this body behind the fire bridge in a helical motion.

Insertions of fireclay cones in flues are known for changing the direction of the flame, but such cones are prematurely consumed and destroyed. Although these insertions absorb heat and give it ofi" again to the surrounding flue part, this heat is mere radiation.

This invention insures direct transmission of heat by forcing the flame, owing to the arrangement of the laminae, to cover the entire surface of the latter, so that the temperature of the flame is transmitted directly to the water surrounding 20 the laminae and thus circulation and evaporation accelerated. As the chimney draft causes the flame to pass through the laminae in several windings, the flames pass through the entire rear portion of the flue and thoroughly cover the walls 25 thereof. By the turning of the flame in the flue particles of flue dust will be entrained and discharged through the chimney, so that automatic cleaning of the tube is insured.

By way of example; the invention is illustrated in the accompanying drawing, in which Fig. 1 is a 5 longitudinal section, Fig. 2 a transverse section.

Referring to the drawing, the portion of the flue disposed behind the bridge is formed so as to form several flues a twisted in the direction of turn. The flame is guided through these flues and turned so that it touches closely the walls of the boiler covered by the feed water, the laminee b acting as contact surfaces being also passed through by feed water.

I claim:

A boiler flue having a fire bridge, a plurality of twisted and water fllled portions behind the fire bridge, said twisted portions being concentrically arranged and causing the flame to pass through RUDOLF GAUTZSCH. 

